SAP Message BP406 - Transaction currency &3 is not equal to budgeting currency &4

Diagnosis
You have selected "object currency" as the budgeting currency in budgetprofile &V1& for WBS element &V2& .
The transaction currency &V3& you entered differs from the objectcurrency &V4&.

System Response
The line entered can only be posted in transaction currency &V4&.

Procedure
Enter &V4& as the transaction currency. You can also leave the currencyfield blank. Object currency &V4& is then automatically used as thetransaction currency.